Quote:
Originally Posted by Astroman
Hi all,
I have been doing some maths and trying to work out what input speed my stepper motor needs to be doing for my Star Tracker mount. In it's current form, which works out well, it takes the input stepper motor between 46 and 47sec to do one revolution. I wanted to be able to make this more accurate.
Sidereal seconds / total reduction
86164 / 1929.886272364913748144
=44.647190476365866588831940649819 sec per revolution. |
hi,
you mentioned that your input speed is 46 to 47secs per rev and your calculation shows you need to speed it up a bit to 44secs.
so for a 5 min exposure, your motor would complete 6.6 revs.
if the error is 2secs per rev, thats 13secs slower than it should be.
i'm not sure how much that would affect widefield imaging.
but if you correct the error, i suppose you could expose longer.